Refrigerating apparatus



JL G. KING Jan. 24, 1933.

REFRIGERATING APPARATUS Filed May 30. 1928 k2 Sheets-Sheet 1 #k r l l g l g Jan. 24, 1933. J. G. KING 1,895,224

REFR IGERATI NG APPARATUS Filed May 30. 1928 '2 sheets-sheet 2 Patented Jan. 24, 1933 UNITED STATES PATENT OFFICE'.

J' ESSE G. KING, 0F DAYTON, OHIO, ASSIGNOR TO FRIGIDAIRE CORPORATION, 0F DAYTON,

OHIO, A CORPORATION 0F DELAWARE REFRIGERATING APPARATUS Application led Iay 30,

This invention relates to refrigerating apparatus and particularly to evaporators or refrigerating elements.v

One of the objects of the invention is to' is simple and economical to manufacture. i

Another object of the invention is to provide a simple and economical form of evaporator which will maintain two temperatures.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a vertical section of a portion of a refrigerating cabinet showing in elevation a refrigerating element constructed in accordance with the present invention;

Fig. 2 is a view of the refrigerating element partly in vertical section and partly in side elevation; and

Fig. 3 is a longitudinal vertical section of a slightly modified form of evaporator.

Referring particularly to Fig. 2, the refrigerating element includes a pair of concentric generally cylindrical shells 10 and 11 which are secured to each other at their ends and have a space 12 between them forming a refrigerant passage or chamber. Preferably the shell 10 is helically corrugated as shown in my application Serial No. 250,407, filed January 30, 1928, its corrugations touching the shell 11 to form a helical passage f or refrigerant from one end of the shell to the other. Surrounding the shells 10 and 11 is another pair of shells 14 and 15 which are similar to the shells 10 and 11 and which form a second helical refrigerant passage 16 which is separated from the first by an insulating air space 17. The shells are held together by any suitable means, for example by spacers `18 and piping connections 19 and 20. The' helical corrugations referred to are made 1928. Serial No. 281,609.

wider at the ends of the shells than in the intermediate portions in order to provide bosses 22 to facilitate the attachment of conduit connections. Preferably one end of the space enclosed by the shells 14 and 15 is closed by a cover plate 23 and the inner shell is provided with one or more shelves 24 for supporting ice-making containers 25. The passages 12 and 16 are connected in series by the connection 19 to form a single refrigerant conduit to which liquid refrigerant 1s admitted at 20 under the control of any suitf able pressure-responsive expansion valve 26 and from which gaseous or evaporated refrlgerant is withdrawn by the conduit 27 connected to the outer passage at 28.

The space 'within the inner pair of shells provides a freezing chamber for freezing liq uids in the containers 25 while the outer pair of shells forms a chilling or cooling member for circulating air and is for this purpose maintained at a somewhat higher temperature than the freezing chamber. It will be understood that because the expansion valve is connected to the passage 12, the greater art of the evaporation and consequently the owest temperature will be produced in this passage. However, some liquid refrigerant will reach the outer passage and be evaporated there, roduclng refrigeration but maintaining a igher temperature. The two passages are separated by the insulating space 17 in order that the heat absorbed from the air by the outer pair of shells will not be transmitted to the inner pair of shells.

Fig. 1 shows the dev ce arran ed in a refrigerating cabinet rwhich has a c illing coinpartment 30 and a storage compartment 31 separated by the partition wall 32. Openings 33 and 34 are provided for thecirculation of air between the compartments. Warm air from the storage compartment enters the.

chamber will be maintained at a temperature of about 20 F. or less, whereas the air cooling passage 16 will be maintained at a temperat-ure of approximately 30 or 35 F. in-

order to chill the circulating air-to a tempera- 5 ture of approximately 45 or 50.

Fig. 3 shows a modified arrangement of the invention wherein 10 and 14' are corrugated shells corresponding to 10 and 14 respectively.- Theseshells are placed in contact with opposite sides of a cylindrical shell 40 which divides the space between the two corrugated shells into the two helical passages, which are connected in series by the opening 19 through the shell 40. All of the shells are secured together at 'their edges to form the two passages indicated. In this arrangement the shell 40 may be constructed of material of poor thermal conductivity, for exam le monel, which permits the maintaining o a relatively lowtemperature in the inner passage and a relatively high temperature in the outer passage. The expansion valve 26 is connected as in the previously described case to the inner passage through the connection 20 and refrigerant is withdrawn from the outer passage through the connection 28. While the forms of embodiment of the invention as herein disclosed, constitute preferred forms, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

' 1. Arefrigerating element for refrigerating apparatus comprising a cylindrical shell, a helically corrugated shell cooperating with the inside of said cylinder to provide a helical refrigerant passage, a second vhelically corrugated shell cooperating with the outside of said cylinder to provide a second helical refrigerant passage, said cylindrical shell being constructed of material of low thermal conductivity.

2. A refrigeratiiig element for refrigerating apparatus comprising a plurality of pairs of concentric shells forming a pair of refrigerant chambers, one of said chambers being disposed around the other and separated therefrom by an insulating space and one of the shells of a pair being helically corrugated to direct the refrigerant in a tortuous pathfbetween the shells.

3. A refrigerating element for refrigerating apparatus comprising a pair of concentric shells, one of the shells being distorted to 0 form an elongated tortuous refrigerant chamber between them and a second pair of concentric shells one of the shells being disv torted forming a second elongated tortuous refrigerant chamber between them, the second pair of shells being disposed around' the first and separated therefrom by an insulating space.

, 4. A refrigerating element for refrigerating apparatus comprising a plurality of pairs of concentric shells forming a pair of refrigerant chambers, one of said chambers being disposed around the other and separated therefrom by an insulating space and one of the shells of each pair being helically corrugated to direct the refrigerant in a tortuous path between the shells.

5. A refrigerating element for freezng ice and for cooling circulating air coinprisin in combination a pair of shells placed one within the other to form a freezing enclosure, the shells being joined at their ends toy form a chamber for circulating refrigerant around the enclosure, means for supporting a freezing container in the freezing enclosure, and a second pair of shells placed one within the other and joined at their ends to form a second chamber for circulating refrigerant, said second chamber being placed around the freezing chamber and separated therefrom by an insulating space for cooling circulating from currents of circulating air.

6. A refrigeratingelement for refrigerating apparatus comprising a pair of helically corrugated shells one around the other, and means cooperating with the shells to provide a pair of tortuous refrigerant passages, said passages being thermally isolated from one another. x

7. An evaporator comprising a .plurality of shells each having at least a portion thereof spaced from `the other and sealed at the edge of said spaced apart portion to provide a plurality of spaced concentric refrigerant passages or chambers therebetween, said p assages or chambers being in communication with eachother, a liquid refrigerant supply connection to one of said passages or chambers and a refrigerant suction connection to another of said passages or chambers.

8. An evaporator comprising a plurality of elongated horizontally disposed shells each .having at least av portion thereof spaced from the other and sealed at the edge of said spaced apart portion to provide a plurality of spaced concentric refrigerant passages or chambers therebetween, said passages or chambers being in coinmunicationwith eachother, a liqportion thereof vspaced from the other and sealed at the edge of said spaced apart portion to provide a plurality of spaced concentric refrigerant passages or chambers therebetween, saidv passages or chambers being in communication with each other, a liquid refrigerant supply connection to one of said passages or chambers and a refrigerant suction connection to another of said passages or chambers.

10. An evaporator comprising a. plurality of shells each having at least a portion thereof spaced from the other and sealed at the edge of said spaced apart portion to provide a plurality of concentric refrigerant passages or chambers therebetweem said passages or chambers being separated from one another by an insulating space, said passages or chambers also being in communication with each other, a liquid refrigerant supply connection to one of said passages or chambers and a refrigerant suction connection to another of said passages or chambers.

11. An evaporator comprising a plurality of elongated horizontally disposed shells each having atleast a portion thereof spaced from the other and sealed at the edge of said spaced apart portion to provide a plurality of concentric refrigerant'passages or chambers therebetween, said passages or chambers being separated from one another b an insulating space, said passages or c iambers also being iii communication withl each other, a liquid refrigerant supply connection to one of said passages or chambers and a refrigerant suction connection to another of said passages or chambers.

12. An evaporator comprisingl a plurality of elongated horizontally disposed cylindrical tubular members each having at least a portion thereof spaced from the -other and sealed at the' edge of said spaced apart portion to provide a plurality of concentric refrigerant passages or chambers therebetween, said passages or chambers being separated from one anotherby an insulating space, said passages or chambers also being Ain communication with each other, a liquid refrigeranty supply connection to one of said passages or chambers and a refrigerant suction connection to another of said passages or chambers. 13. An yevaporator comprising a plurality of pairs of shells, one of the shells of one pair thereof having at least a portion spaced from its cooperating shell and sealed at the edge of said spaced apart portion to its cooperating shell to provide an outer refrigerant passage or chamber therebetween, one of the shells of the other pair thereof having at least a portion spaced from its' cooperating shell and sealed at the edge of said spaced apart portion to provide an'iiiner refrigerant passage or chamber therebetween, said .inner refrigerant passage or chamber being spaced from and in communication with said outer refrigerant passage or chamber and arranged concentric therewith, ay liquid refrigerant supply connection to one of said passages or chambers and a refrigerant suction connection to the other of said passages or chambers.

cooperating shell and sealed at the edge of said spaced apart portion to its cooperating shell to provide an outer refrigerant pas sage or chamber therebetween, one of ,the shells of the other pair thereof having at least a portion spaced from its cooperating shell and sealed at the edge of said spaced apart portion to provide an inner refrigerant passage or chamber therebetween, said inner refrigerant passage or chamber being spaced from and in communication with said outer refrigerant passage or chamber and arranged concentric tlieiewitli, a liquid refrigerant supply connection to one of said passages'or chambers and a refrigerant suction connection to the other of said passages or chambers. Y

" 15. An evaporator comprising a plurality of pairs of elongated horizontally disposed cylindrical shells, one of the shells of one pair thereof having at least a portion spaced from its cooperating shell and sealed at the edge of said spaced apart portion Foits cooperating shell to provide an outer refrigerant passage or chamber therebetween, one of the shells of the other pair thereof vhaving at least a portion spaced from its cooperating shelland sealed at the edge of said spaced apart portion to provide aniiiner refrigerant passage or chamber therebetween, said inner refrigerant passage or chamber being'spaced from and in communication with said outer refrigerant passage or chamber, a liquid refrigerant supply connection to one of said i I an elongated inner sheet metal member andl an outer elongated sheet metal member closed at their edges, one of said members having at least a portion thereof spaced from the other of said members to providerefrigerant conveying means therebetween, said wall being arranged to provide a sharp freezing zone adapted to receive a receptacle to be cooled, a second wall including an elongated inner sheet metal member and an outer elongated sheet `metal member closed at their edges, one of said members of said second wall having at least a portion thereof spaced from the other of said members of said second wall to provide refrigerant conveying means therebetween, said second wall being spaced from said first wall and arranged to substantially enclose said first Wall, the refrigerant conveying means in said first wall having a connection with the refrigerant conveying means in said second Wall, and a liquid refrigerant supply connection to one of said refrigerant conveying means and a refrigerant suction connection to the other of said refrigerant conveying means.

17. A sheet metal evaporator for refrigerating apparatus comprsing a wall including an elongated inner sheet metal member and an outer elongated sheet metal member closed at their edges, one of said members having 5 at least al portion thereof spaced from the other of said members to provide refrigerant conveying means therebetween, said wall being arranged to provide a sharp freezing zone adapted to receive a receptacle to be cooled, a second wall including an elongated inner sheet metal member and an outer elongated sheet metal member, one of said members of said second Wall having at least a portion thereof spaced'from the other of said members of said second wall to provide refrigerant conveying means therebetween, said second wall being spaced and insulated from said first wall and arranged to substantially enclose said rst wall, the refrigerant conveying means in said rst wall having a connection with the refrigerant conveying means in said second wall, and a liquid refrigerant supply connection to the refrigerant conveying means in said first wall and a refrigerant suction connection to the refrigerant conveying means in said second wall.

JIn testimony whereof I hereto aflix my signature.

v JESSE G. KING. 

